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- 2Sh6et sSheet 1. W. B. JOHNSON.

S W a S n 1 G g n 1 1 1 P r 0 f e n 1 h 04 a M Patented June 8, 1880.

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ILFEIERB, PHOTD-UTMOGRAPNER. WASHINGTON. D C.

2 Sheets-"Sheet 2.

W. B. JOHNSON. Machine for Filing Gin-Saws.

Patented June 8,1880.

Inventor IVitnesses PLPEIERS. PHOTOLITNOGRAPHER. WASHINGTON, D I:

WILLIAM B. JOHNSON, OF ATLANTA, GEORGIA.

MACHINE FOR FILING GIN-SAWS.

SPECIFICATION forming part of Letters Patent No. 228,644, dated June 8, 1880.

Application filed February I), 1880.

To all whom it may concern Be it known that 1, WILLIAM B. J oHNsoN, of Atlanta, in the county of Fulton, and in the State of Georgia, have invented certain new and useful Improvements in Machines for Filing Gin-Saws; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification. A

The nature of my invention consists in the construction and arrangement of a machine for filing or sharpening gin-saws, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawings, in which- Figure l is a side elevation of my machine. Fig. 2 is a plan view of the same.

A represents the frame of the machine, provided at the front with legs l3 13, which are adjustable upon the side bars of the frame. Under the rear end of the frame are sharp points a a, to keep the machine from slipping back when in operation.

0 O are the file-holders, provided at their front ends with the files D D, and arranged in inclined positions, as shown. one above and the other below the body of the frame. Each file-holder moves through two posts or bearings, E and F.

Each front bearing, E, is movable in aslot, b, in the frame, and has a spring, (I, acting upon it, the coil of which spring is placed upon a stud, 0. One end of the spring is threaded, and is passed through an opening in a lug, c, and the tension of the spring is regulated by a nut, f, which engages with said threaded end. By these means the springs may be made to bear against the bearing E with the desired pressure. If the sawteeth are very dull, the files should, of course, be forced against them with considerable pressure, and if not very dull with very little.

Each rear post or hearing, F, is adjustable in and out, as well as up and down, on the frame by means of nuts f f, so as to regulate the inclination of the file to suit circumstances,

the bed being slotted to permit such lateral adjustment of said bearing.

The rear portion of each file-holder is provided with a spiral rib or flange, h, which fits in a groove in the rear post, F, and when the file-holder is moved back and forth the file obtains a slight rotary motion also for the purpose of making the tooth slightly or more or less concave or hollowed out, as is necessary for gin-saws.

G is the operating-lever, pivoted at 'i to the frame, its lower end being connected by rods H H with the file-holders for giving them the necessary motion. The upper end of the lever Gr works through a slot in the frame, and is itself slotted, as shown at or. In this slotis placed a roller, I, which projects on both sides of the lever, and one end of said roller works upon a slide, J, on the frame. At the front end of the slide J is hinged the pawl L, which is to rest upon the saw and feed the same. As the upper end of the operating-lever O is moved forward the roller I strikes a shoulder, m, on the slide just as the stroke is completed, moving said slide a certain predetermined distance to feed the saw the distance of one tooth. A spring, n, moves the slide and pawl back again, and the extent of the movement is regulated by means of a set-screw, 1).

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a gin-saw-filing machine, the combination of the file-holders O, the movable front bearings, E, springs d, studs 0, lugs 0, nuts j", and the adjustable rear posts, F, substan tial] y as and for the purposes herein set forth.

2. The combination of the file-holders C, arranged in the movable bearings E and adjustable posts F, the connecting-rods 11, slot ted lever Gr, roller I, slide J, pawl L, spring a, and set-screw 19, substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 23d day of January, 1880.

WILLIAM B. JoHNsoN. 1 s.]'

Witnesses:

WM. SMITH, JOHN RHEA. 

